CN218412254U

CN218412254U - Fiber grating temperature compensation type humidity sensor for cable

Info

Publication number: CN218412254U
Application number: CN202222562798.1U
Authority: CN
Inventors: 叶胜伟; 朱宇朋; 孙茂松; 申建功
Original assignee: Henan Minghai Optoelectronic Technology Co ltd
Current assignee: Henan Minghai Optoelectronic Technology Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2023-01-31
Anticipated expiration: 2032-09-27

Abstract

The utility model relates to a fiber grating sensor field, concretely relates to fiber grating temperature compensation type humidity transducer for cable. Including the encapsulation casing, the encapsulation casing includes the shell, and the one end shutoff of shell, the other end of shell have been seted up uncovered, install the inner shell in the shell, install the end cover in the opening end of shell, inside optic fibre runs through the end cover and extends to the inner shell, the window has all been seted up to the both sides of inner shell, has seted up a plurality of round holes on the shell region that corresponds with the window, and the fiber grating district is made through laser engraving to the fiber grating part in the inner shell, and the fiber grating district corresponds with the window, the fiber grating district is including the temperature bars district and the humidity bars district of establishing ties. The utility model discloses, the temperature bars district and the humidity bars district of establishing ties are made on the polished rod that corresponds with the window of inner shell, utilize temperature bars district and humidity bars district to measure temperature parameter and humidity parameter respectively, realize temperature compensation, improve the accuracy that cable humidity detected.

Description

Fiber grating temperature compensation type humidity sensor for cable

Technical Field

The utility model relates to a fiber grating sensor field, concretely relates to fiber grating temperature compensation type humidity transducer for cable.

Background

The cable is the main heavy burden structure in suspension bridge and cable-stay bridge, and the weight that the bridge bore and self weight all need pass through cable transmission to the cable tower, so the safety in utilization of bridge is directly influenced to the performance of cable. One of the reasons for the reduced cable performance is its ageing from external influences. The rainwater erosion can cause the humidity inside the cable to rise, accelerate the metal corrosion of the cable and further cause the aging failure. Once a cable fails, serious consequences can occur, resulting in safety accidents and property damage. If the humidity in the cable can be detected, the performance of the cable is estimated, measures are taken in advance after the abnormity is found, the safety of the cable and the bridge can be guaranteed, and the service life is prolonged. The fiber grating is a passive sensitive element, the wavelength of the reflected wave of the optical fiber can be changed due to the humidity change, and the fiber grating humidity sensor can be manufactured according to the relation. Compared with other types of sensors, the fiber grating humidity sensor has the advantages of simple structure, light weight, small volume, convenient use and no electromagnetic interference, thereby being widely applied in various fields.

An invention with the application number of CN201120328304.2, namely an intelligent cable for bridges capable of sensing internal humidity, discloses an intelligent cable for bridges capable of sensing internal humidity, which is characterized in that: and an optical fiber humidity sensor is embedded in the cable. The utility model discloses can perceive intelligent cable for bridge of inside humidity, optic fibre humidity transducer total length is buried or local embedding inside the cable. The solution described in this patent requires the fiber optic moisture sensor to be integrated with the cable during the manufacturing process. The method needs to customize the cable for realizing the function, and has poor flexibility and low applicability. The existing fiber bragg grating humidity sensor has the problem that a plurality of physical quantities are sensitive in a cross mode, namely, when humidity is measured, the variation of environmental temperature can cause the deviation of a humidity measurement result, and the detection accuracy is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that one kind can adopt the integral type encapsulation for the sensor is miniaturized, improves the sensor and uses flexibility and convenience, can reduce the fiber grating temperature compensation type humidity transducer for the cable of temperature to the influence of measuring cable humidity result.

In order to realize the purpose, the utility model provides a technical scheme is:

the utility model provides a fiber grating temperature compensation type humidity transducer for cable, including the encapsulation casing, the encapsulation casing includes the shell, the one end shutoff of shell, the other end of shell has been seted up uncovered, install the inner shell in the shell, install the end cover in the uncovered end of shell, optic fibre runs through the end cover and extends to inside the inner shell, the window has all been seted up to the both sides of inner shell, a plurality of round holes have been seted up on the shell region that corresponds with the window, the fiber grating district is carved into through laser to the fiber part in the inner shell, fiber grating district corresponds with the window, the round hole is linked together through window and fiber grating district, fiber grating district is including the temperature grid district and the humidity grid district of establishing ties.

Specifically, one end of the inner shell, which is close to the blocking end of the outer shell, is glued to the optical fiber with the optical fiber grating area.

Specifically, the plugging end of the shell is a conical end.

Specifically, the shell is in threaded connection with the end cover.

Specifically, the optical fiber is fixedly connected with the end cover in an adhesive joint mode.

Specifically, the packaging shell is made of a metal material.

Specifically, the packaging shell is made of hard plastic.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses, the temperature grating district and the humidity grating district of making the series connection on the polished rod that corresponds with the window of inner shell utilize temperature grating district and humidity grating district to measure temperature parameter and humidity parameter respectively, realize temperature compensation, improve the accuracy that cable humidity detected. This sensor adopts miniaturized integration encapsulation, has certain intensity, through set up the awl end on the shell, conveniently inserts in the mounting hole of various cables, and the flexibility is strong, need not special customization cable, and the installation is simple convenient.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a structural view of the inner case.

Fig. 3 is a sectional view of the inner case.

Part names in the drawings are as follows:

1, an outer shell 2, an inner shell 3, an end cover 4, an optical fiber 5, an optical fiber grating area 6, a round hole 7 and a window.

Detailed Description

Example 1

As shown in fig. 1-3, a fiber grating temperature compensation type humidity sensor for a cable comprises a package housing made of metal. The packaging shell comprises a shell 1, one end of the shell 1 is plugged, the plugging end of the shell 1 is a conical end, and the other end of the shell 1 is provided with an opening. An inner shell 2 is arranged in the outer shell 1, an end cover 3 is arranged in the open end of the outer shell 1, and the outer shell 1 is in threaded connection with the end cover 3. Inside optic fibre 4 runs through end cover 3 and extends to inner shell 2, window 7 has all been seted up to the both sides of inner shell 2, has seted up a plurality of round holes 6 on the shell 1 region that corresponds with window 7. The optical fiber 4 in the inner shell 2 is partially etched into an optical fiber grating area 5 through laser, the optical fiber grating area 5 corresponds to the window 7, and the optical fiber grating area 5 comprises a temperature grating area and a humidity grating area which are connected in series. One end of the inner shell 2 close to the blocking end of the outer shell 1 is in adhesive joint with an optical fiber 4 with an optical fiber grating area 5, and the optical fiber 4 is in adhesive joint and fixed connection with the end cover 3.

The round hole 6 is communicated with the fiber grating area 5 through the window 7, and the round hole 6 forms a ventilation channel for detecting temperature and humidity through the window 7 and is used for the fiber grating area 5 to contact with the external environment. In this embodiment, the encapsulation casing has adopted the metal material, because the metal material has the fast characteristics of heat conduction, therefore this sensor has the quick advantage of measurement. And the integrated packaging is adopted, so that the structural reliability of the product is improved, the damage of the external environment to the sensor is reduced, and the service life is prolonged.

Example 2

Except for the material of the packaging shell, other technical signs are the same as those of the sensor in embodiment 1.

The packaging shell is made of hard plastic.

The packaging shell is made of plastic materials, so that the production cost can be reduced, and the packaging shell can be prevented from being corroded.

The utility model discloses, the temperature grating district and the humidity grating district of establishing ties are made on the polished rod that corresponds with the window 7 of inner shell 2, utilize temperature grating district and humidity grating district to measure temperature parameter and humidity parameter respectively, realize temperature compensation, improve the accuracy that cable humidity detected. This sensor adopts miniaturized integration encapsulation, has certain intensity, through set up the awl end on shell 1, conveniently inserts in the mounting hole of various cables, and the flexibility is strong, need not the special customization cable, and the installation is simple convenient.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. The utility model provides a fiber grating temperature compensation type humidity transducer for cable, including the encapsulation casing, a serial communication port, the encapsulation casing includes shell (1), the one end shutoff of shell (1), it is uncovered to have seted up the other end of shell (1), install inner shell (2) in shell (1), install end cover (3) in the opening end of shell (1), fiber (4) run through end cover (3) and extend to inside inner shell (2), window (7) have all been seted up to the both sides of inner shell (2), shell (1) that correspond with window (7) have seted up a plurality of round holes (6) on the region, fiber (4) part in inner shell (2) is made fiber grating district (5) through laser lithography, fiber grating district (5) correspond with window (7), round hole (6) are linked together through window (7) and fiber grating district (5), fiber grating district (5) are including the temperature bars district and the humidity bars district of establishing ties.

2. The fiber bragg grating temperature compensation type humidity sensor for the cable as claimed in claim 1, wherein one end of the inner housing (2) close to the plugging end of the outer housing (1) is glued with the optical fiber (4) with the fiber bragg grating area (5).

3. The FBG temperature compensation type humidity sensor for cables as claimed in claim 1, wherein the blocking end of the housing (1) is a conical end.

4. The FBG temperature compensation type humidity sensor for cables as claimed in claim 1, wherein the housing (1) is in threaded connection with the end cap (3).

5. The fiber bragg grating temperature compensation type humidity sensor for the cable as claimed in claim 1, wherein the optical fiber (4) is fixedly connected with the end cover (3) in a gluing manner.

6. The FBG temperature compensated moisture sensor for cables of any of claims 1, 2, 3, 4 or 5, wherein the package housing is made of metal.

7. The FBG temperature compensated moisture sensor for cables of any of claims 1, 2, 3, 4 or 5, wherein the package housing is made of rigid plastic material.